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	<title>Pelargonium en Geranium</title>
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	<description>Stichting Nederlandse Pelargonium en Geranium Vrienden</description>
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	<title>Pelargonium en Geranium</title>
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	<item>
		<title>Mijn grondmengsel voor Pelargonium</title>
		<link>https://www.npgv.nl/mijn-grondmengsel-voor-pelargonium/</link>
					<comments>https://www.npgv.nl/mijn-grondmengsel-voor-pelargonium/#respond</comments>
		
		<dc:creator><![CDATA[Webredactie]]></dc:creator>
		<pubDate>Mon, 10 Aug 2026 14:30:10 +0000</pubDate>
				<category><![CDATA[Potgrond]]></category>
		<category><![CDATA[grondmengsel]]></category>
		<guid isPermaLink="false">https://www.npgv.nl/?p=103</guid>

					<description><![CDATA[door Peter van Baaren Grob Toen ik in 2016 na jaren eindelijk weer een broeikas(je) kreeg was ik de koning te rijk.Echter: onze tuin ligt op het zuiden en de volle lengte van het glasgedeelte op het westen. Aan de zuidzijde staan achter in de tuin enorme bomen. De ochtendzon piept dus tot een uur<p><a href="https://www.npgv.nl/mijn-grondmengsel-voor-pelargonium/#more-103" class="more-link">Meer lezen</a></p>]]></description>
										<content:encoded><![CDATA[
<p class="wp-block-paragraph">door Peter van Baaren Grob</p>


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<p class="wp-block-paragraph">Toen ik in 2016 na jaren eindelijk weer een broeikas(je) kreeg was ik de koning te rijk.<br>Echter: onze tuin ligt op het zuiden en de volle lengte van het glasgedeelte op het westen. Aan de zuidzijde staan achter in de tuin enorme bomen. De ochtendzon piept dus tot een uur of twaalf net over de tuinmuur door het dak naar binnen, prima. Maar de zon verdwijnt daarna achter de bomen om vervolgens na 14.00 uur weer tevoorschijn te komen en vervolgens tot zonsondergang genadeloos in de kas te schijnen. Gevolg: snoei- maar dan ook snoeiheet wordt het binnen.<br>Ondanks schermdoek verbranden de wortels van mijn pelargoniums door de hitte in de kas. De potgrond wordt simpelweg te heet en de potgrond die ik gebruikte hield te lang het vocht vast, gevolg: gekookte wortels.<br>Ik moest dus op zoek naar een grondmengel dat geschikt is voor deze wat brute condities.</p>



<p class="wp-block-paragraph">Na vele experimenten ben op het volgende mengsel gekomen wat mij, gezien de condities waarvoor ik het nodig heb, prima bevalt:<br>60% DCM Universeelpotgrond (met een toegevoegde meststof NPK 12-14-24)<br>40% Perliet, Akadama, Lavagruis en aquariumgrind</p>



<p class="wp-block-paragraph">Ik heb geprobeerd over te stappen op potgrond zonder tuinturf maar het is mij nog niet gelukt hier een goede variant in te vinden.<br>De turfvrije potgrondmengsels blijven te lang nat (zeker voor pelargoniums) en ook is de NPK-verhouding van de toegevoegde meststof niet geschikt voor pelargoniums (laatst had ik er bijvoorbeeld een die een verhouding had van: NPK 10-4-4!!).<br>Ik zocht een grondmengsel welke:</p>



<p class="wp-block-paragraph">1. goed waterdoorlatend is<br>2. maar ook water kan vasthouden op zo’n manier dat het geschikt is voor pelargoniums<br>3. wekelijks toegediende voeding kan opslaan en gemakkelijk weer vrijgeeft<br>4. zodanig luchtig is dat een optimale wortelontwikkeling mogelijk is<br>Belangrijke punten en de 60-40 verhouding die ik hierboven beschrijf maakt alle vier de punten mogelijk.<br>Als vergelijk twee foto’s, potgrond zoals je hem koopt en na menging:</p>



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<p class="wp-block-paragraph">Ik begin altijd met de potgrond zeven, grove stukken blijven zo achter en ik verbeeld mij dat dit al heel wat beter is (…).</p>



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<p class="wp-block-paragraph">Vervolgens voeg ik de andere materialen toe:</p>



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<figure data-wp-context="{&quot;imageId&quot;:&quot;6ac381a863954&quot;}" data-wp-interactive="core/image" data-wp-key="6ac381a863954" class="wp-block-image size-full wp-lightbox-container"><img loading="lazy" decoding="async" width="454" height="237" data-wp-class--hide="state.isContentHidden" data-wp-class--show="state.isContentVisible" data-wp-init="callbacks.setButtonStyles" data-wp-on--click="actions.showLightbox" data-wp-on--load="callbacks.setButtonStyles" data-wp-on--pointerdown="actions.preloadImage" data-wp-on--pointerenter="actions.preloadImageWithDelay" data-wp-on--pointerleave="actions.cancelPreload" data-wp-on-window--resize="callbacks.setButtonStyles" src="https://www.npgv.nl/wp-content/uploads/2026/08/perliet-groot.jpg" alt="" class="wp-image-202" srcset="https://www.npgv.nl/wp-content/uploads/2026/08/perliet-groot.jpg 454w, https://www.npgv.nl/wp-content/uploads/2026/08/perliet-groot-300x157.jpg 300w" sizes="auto, (max-width: 454px) 100vw, 454px" /><button
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<p class="wp-block-paragraph">Bovenste rij: Perliet, Akadama, Lavagruis<br>Onderste rij: Alpen Grind, Aquariumgrind 3-6 Mm, Aquariumgrind Calstone 1-2 Mm, Aquariumgrind Loire 1-3 Mm</p>



<p class="wp-block-paragraph">Wat meer info over de materialen:</p>



<figure data-wp-context="{&quot;imageId&quot;:&quot;6ac381a863f7e&quot;}" data-wp-interactive="core/image" data-wp-key="6ac381a863f7e" class="wp-block-image size-full is-resized wp-lightbox-container"><img loading="lazy" decoding="async" width="416" height="416" data-wp-class--hide="state.isContentHidden" data-wp-class--show="state.isContentVisible" data-wp-init="callbacks.setButtonStyles" data-wp-on--click="actions.showLightbox" data-wp-on--load="callbacks.setButtonStyles" data-wp-on--pointerdown="actions.preloadImage" data-wp-on--pointerenter="actions.preloadImageWithDelay" data-wp-on--pointerleave="actions.cancelPreload" data-wp-on-window--resize="callbacks.setButtonStyles" src="https://www.npgv.nl/wp-content/uploads/2026/08/perliet-klein.jpg" alt="" class="wp-image-206" style="width:268px;height:auto" srcset="https://www.npgv.nl/wp-content/uploads/2026/08/perliet-klein.jpg 416w, https://www.npgv.nl/wp-content/uploads/2026/08/perliet-klein-300x300.jpg 300w, https://www.npgv.nl/wp-content/uploads/2026/08/perliet-klein-150x150.jpg 150w" sizes="auto, (max-width: 416px) 100vw, 416px" /><button
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<p class="wp-block-paragraph">Perliet is een anorganisch gesteente, lava dat zo is verhit dat het materiaal geëxpandeerd is (als popcorn) en er een poreuze, lichte korrel overblijft. Het is een lichtgewicht, steriel en makkelijk te gebruiken product dat lang meegaat. Doordat het gesteente poreus is, kan het water opnemen maar zorgt ook voor luchtigheid in je potgrondmix. Een luchtiger potgrondmengsel betekent betere drainage en dus geen onnodig natte voeten voor je planten.</p>



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<p class="wp-block-paragraph">14 liter | Double Line &#8211; harde kwaliteit (gekocht bij <a href="https://www.bonsaiplaza.com/" target="_blank" rel="noreferrer noopener">Bonsaiplaza</a>)<br>• Een kleiachtige bodem van vulkanische oorsprong.<br>• pH-neutraal<br>• Degradeert in 2-3 jaar.<br>• Neemt zeer goed water op en slaat ionen op.<br>• Zorgt voor een perfecte afwatering.<br>• Bevat geen voedingsstoffen of sporenelementen.<br>• Optimale mestregulatie mogelijk.<br>• Voor zowel loofbomen als coniferen.<br></p>



<figure data-wp-context="{&quot;imageId&quot;:&quot;6ac381a864978&quot;}" data-wp-interactive="core/image" data-wp-key="6ac381a864978" class="wp-block-image size-full is-resized wp-lightbox-container"><img loading="lazy" decoding="async" width="414" height="414" data-wp-class--hide="state.isContentHidden" data-wp-class--show="state.isContentVisible" data-wp-init="callbacks.setButtonStyles" data-wp-on--click="actions.showLightbox" data-wp-on--load="callbacks.setButtonStyles" data-wp-on--pointerdown="actions.preloadImage" data-wp-on--pointerenter="actions.preloadImageWithDelay" data-wp-on--pointerleave="actions.cancelPreload" data-wp-on-window--resize="callbacks.setButtonStyles" src="https://www.npgv.nl/wp-content/uploads/2026/08/dcm-lava.jpg" alt="" class="wp-image-217" style="width:270px;height:auto" srcset="https://www.npgv.nl/wp-content/uploads/2026/08/dcm-lava.jpg 414w, https://www.npgv.nl/wp-content/uploads/2026/08/dcm-lava-300x300.jpg 300w, https://www.npgv.nl/wp-content/uploads/2026/08/dcm-lava-150x150.jpg 150w" sizes="auto, (max-width: 414px) 100vw, 414px" /><button
			class="lightbox-trigger"
			type="button"
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			data-wp-on--click="actions.showLightbox"
			data-wp-style--right="state.thisImage.buttonRight"
			data-wp-style--top="state.thisImage.buttonTop"
		>
			<svg xmlns="http://www.w3.org/2000/svg" width="12" height="12" fill="none" viewBox="0 0 12 12">
				<path fill="#fff" d="M2 0a2 2 0 0 0-2 2v2h1.5V2a.5.5 0 0 1 .5-.5h2V0H2Zm2 10.5H2a.5.5 0 0 1-.5-.5V8H0v2a2 2 0 0 0 2 2h2v-1.5ZM8 12v-1.5h2a.5.5 0 0 0 .5-.5V8H12v2a2 2 0 0 1-2 2H8Zm2-12a2 2 0 0 1 2 2v2h-1.5V2a.5.5 0 0 0-.5-.5H8V0h2Z" />
			</svg>
		</button><figcaption class="wp-element-caption"><strong>DCM Kleigrondverbeteraar Lava</strong></figcaption></figure>



<p class="wp-block-paragraph">DCM Kleigrondverbeteraar Lava is een middel dat in de handel is om o.a. zware gronden (kleigrond) te verluchten of te draineren. Het zijn harde lavakorrels van 0-3 mm met een natuurlijke oorsprong en zorgen voor het verbeteren van de lucht-waterhuishouding van bodems.<br>De poreuze lavakorreltjes zijn ideaal om de potgrond te verluchten en de wortelvorming van de pelargoniums te vergemakkelijken.<br>Verder de verschillende soorten aquariumgrind. Ik gebruik de volgende, allemaal te koop bij goed gesorteerde dierenwinkels. Aquariumgrind is schoon en gezuiverd.<br></p>



<p class="wp-block-paragraph"><br></p>



<div class="wp-block-group"><div class="wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained">
<div class="wp-block-columns are-vertically-aligned-center is-layout-flex wp-container-core-columns-is-layout-8f761849 wp-block-columns-is-layout-flex">
<div class="wp-block-column is-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow" style="flex-basis:100%">
<figure data-wp-context="{&quot;galleryId&quot;:&quot;6ac381a864c12&quot;}" data-wp-interactive="core/gallery" class="wp-block-gallery has-nested-images columns-default is-cropped wp-block-gallery-2 is-layout-flex wp-block-gallery-is-layout-flex">
<figure data-wp-context="{&quot;imageId&quot;:&quot;6ac381a864efa&quot;}" data-wp-interactive="core/image" data-wp-key="6ac381a864efa" class="wp-block-image size-large wp-lightbox-container"><img loading="lazy" decoding="async" width="413" height="413" data-wp-class--hide="state.isContentHidden" data-wp-class--show="state.isContentVisible" data-wp-init="callbacks.setButtonStyles" data-wp-on--click="actions.showLightbox" data-wp-on--load="callbacks.setButtonStyles" data-wp-on--pointerdown="actions.preloadImage" data-wp-on--pointerenter="actions.preloadImageWithDelay" data-wp-on--pointerleave="actions.cancelPreload" data-wp-on-window--resize="callbacks.setButtonStyles" data-id="236" src="https://www.npgv.nl/wp-content/uploads/2026/08/aquariumgrind.jpg" alt="" class="wp-image-236" srcset="https://www.npgv.nl/wp-content/uploads/2026/08/aquariumgrind.jpg 413w, https://www.npgv.nl/wp-content/uploads/2026/08/aquariumgrind-300x300.jpg 300w, https://www.npgv.nl/wp-content/uploads/2026/08/aquariumgrind-150x150.jpg 150w" sizes="auto, (max-width: 413px) 100vw, 413px" /><button
			class="lightbox-trigger"
			type="button"
			aria-haspopup="dialog"
			data-wp-bind--aria-label="state.thisImage.triggerButtonAriaLabel"
			data-wp-init="callbacks.initTriggerButton"
			data-wp-on--click="actions.showLightbox"
			data-wp-style--right="state.thisImage.buttonRight"
			data-wp-style--top="state.thisImage.buttonTop"
		>
			<svg xmlns="http://www.w3.org/2000/svg" width="12" height="12" fill="none" viewBox="0 0 12 12">
				<path fill="#fff" d="M2 0a2 2 0 0 0-2 2v2h1.5V2a.5.5 0 0 1 .5-.5h2V0H2Zm2 10.5H2a.5.5 0 0 1-.5-.5V8H0v2a2 2 0 0 0 2 2h2v-1.5ZM8 12v-1.5h2a.5.5 0 0 0 .5-.5V8H12v2a2 2 0 0 1-2 2H8Zm2-12a2 2 0 0 1 2 2v2h-1.5V2a.5.5 0 0 0-.5-.5H8V0h2Z" />
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		</button><figcaption class="wp-element-caption"><strong>Aquariumgrind 3-6 Mm</strong></figcaption></figure>



<figure data-wp-context="{&quot;imageId&quot;:&quot;6ac381a865394&quot;}" data-wp-interactive="core/image" data-wp-key="6ac381a865394" class="wp-block-image size-large wp-lightbox-container"><img loading="lazy" decoding="async" width="411" height="411" data-wp-class--hide="state.isContentHidden" data-wp-class--show="state.isContentVisible" data-wp-init="callbacks.setButtonStyles" data-wp-on--click="actions.showLightbox" data-wp-on--load="callbacks.setButtonStyles" data-wp-on--pointerdown="actions.preloadImage" data-wp-on--pointerenter="actions.preloadImageWithDelay" data-wp-on--pointerleave="actions.cancelPreload" data-wp-on-window--resize="callbacks.setButtonStyles" data-id="237" src="https://www.npgv.nl/wp-content/uploads/2026/08/calstone.jpg" alt="" class="wp-image-237" srcset="https://www.npgv.nl/wp-content/uploads/2026/08/calstone.jpg 411w, https://www.npgv.nl/wp-content/uploads/2026/08/calstone-300x300.jpg 300w, https://www.npgv.nl/wp-content/uploads/2026/08/calstone-150x150.jpg 150w" sizes="auto, (max-width: 411px) 100vw, 411px" /><button
			class="lightbox-trigger"
			type="button"
			aria-haspopup="dialog"
			data-wp-bind--aria-label="state.thisImage.triggerButtonAriaLabel"
			data-wp-init="callbacks.initTriggerButton"
			data-wp-on--click="actions.showLightbox"
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			data-wp-style--top="state.thisImage.buttonTop"
		>
			<svg xmlns="http://www.w3.org/2000/svg" width="12" height="12" fill="none" viewBox="0 0 12 12">
				<path fill="#fff" d="M2 0a2 2 0 0 0-2 2v2h1.5V2a.5.5 0 0 1 .5-.5h2V0H2Zm2 10.5H2a.5.5 0 0 1-.5-.5V8H0v2a2 2 0 0 0 2 2h2v-1.5ZM8 12v-1.5h2a.5.5 0 0 0 .5-.5V8H12v2a2 2 0 0 1-2 2H8Zm2-12a2 2 0 0 1 2 2v2h-1.5V2a.5.5 0 0 0-.5-.5H8V0h2Z" />
			</svg>
		</button><figcaption class="wp-element-caption"><strong>Aquariumgrind Calstone 1-2 Mm</strong></figcaption></figure>



<figure data-wp-context="{&quot;imageId&quot;:&quot;6ac381a8657d6&quot;}" data-wp-interactive="core/image" data-wp-key="6ac381a8657d6" class="wp-block-image size-large wp-lightbox-container"><img loading="lazy" decoding="async" width="411" height="411" data-wp-class--hide="state.isContentHidden" data-wp-class--show="state.isContentVisible" data-wp-init="callbacks.setButtonStyles" data-wp-on--click="actions.showLightbox" data-wp-on--load="callbacks.setButtonStyles" data-wp-on--pointerdown="actions.preloadImage" data-wp-on--pointerenter="actions.preloadImageWithDelay" data-wp-on--pointerleave="actions.cancelPreload" data-wp-on-window--resize="callbacks.setButtonStyles" data-id="244" src="https://www.npgv.nl/wp-content/uploads/2026/08/loire.jpg" alt="" class="wp-image-244" srcset="https://www.npgv.nl/wp-content/uploads/2026/08/loire.jpg 411w, https://www.npgv.nl/wp-content/uploads/2026/08/loire-300x300.jpg 300w, https://www.npgv.nl/wp-content/uploads/2026/08/loire-150x150.jpg 150w" sizes="auto, (max-width: 411px) 100vw, 411px" /><button
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			type="button"
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			data-wp-on--click="actions.showLightbox"
			data-wp-style--right="state.thisImage.buttonRight"
			data-wp-style--top="state.thisImage.buttonTop"
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			<svg xmlns="http://www.w3.org/2000/svg" width="12" height="12" fill="none" viewBox="0 0 12 12">
				<path fill="#fff" d="M2 0a2 2 0 0 0-2 2v2h1.5V2a.5.5 0 0 1 .5-.5h2V0H2Zm2 10.5H2a.5.5 0 0 1-.5-.5V8H0v2a2 2 0 0 0 2 2h2v-1.5ZM8 12v-1.5h2a.5.5 0 0 0 .5-.5V8H12v2a2 2 0 0 1-2 2H8Zm2-12a2 2 0 0 1 2 2v2h-1.5V2a.5.5 0 0 0-.5-.5H8V0h2Z" />
			</svg>
		</button><figcaption class="wp-element-caption"><strong>Aquariumgrind Loire 1-3 Mm</strong></figcaption></figure>



<figure data-wp-context="{&quot;imageId&quot;:&quot;6ac381a865c2d&quot;}" data-wp-interactive="core/image" data-wp-key="6ac381a865c2d" class="wp-block-image size-large wp-lightbox-container"><img loading="lazy" decoding="async" width="414" height="414" data-wp-class--hide="state.isContentHidden" data-wp-class--show="state.isContentVisible" data-wp-init="callbacks.setButtonStyles" data-wp-on--click="actions.showLightbox" data-wp-on--load="callbacks.setButtonStyles" data-wp-on--pointerdown="actions.preloadImage" data-wp-on--pointerenter="actions.preloadImageWithDelay" data-wp-on--pointerleave="actions.cancelPreload" data-wp-on-window--resize="callbacks.setButtonStyles" data-id="234" src="https://www.npgv.nl/wp-content/uploads/2026/08/alpengrind.jpg" alt="" class="wp-image-234" srcset="https://www.npgv.nl/wp-content/uploads/2026/08/alpengrind.jpg 414w, https://www.npgv.nl/wp-content/uploads/2026/08/alpengrind-300x300.jpg 300w, https://www.npgv.nl/wp-content/uploads/2026/08/alpengrind-150x150.jpg 150w" sizes="auto, (max-width: 414px) 100vw, 414px" /><button
			class="lightbox-trigger"
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			aria-haspopup="dialog"
			data-wp-bind--aria-label="state.thisImage.triggerButtonAriaLabel"
			data-wp-init="callbacks.initTriggerButton"
			data-wp-on--click="actions.showLightbox"
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			<svg xmlns="http://www.w3.org/2000/svg" width="12" height="12" fill="none" viewBox="0 0 12 12">
				<path fill="#fff" d="M2 0a2 2 0 0 0-2 2v2h1.5V2a.5.5 0 0 1 .5-.5h2V0H2Zm2 10.5H2a.5.5 0 0 1-.5-.5V8H0v2a2 2 0 0 0 2 2h2v-1.5ZM8 12v-1.5h2a.5.5 0 0 0 .5-.5V8H12v2a2 2 0 0 1-2 2H8Zm2-12a2 2 0 0 1 2 2v2h-1.5V2a.5.5 0 0 0-.5-.5H8V0h2Z" />
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</figure>
</div>
</div>



<p class="wp-block-paragraph">Grind zorgt voor drainage en structuur in de potgrond. Voordeel is ook dat het grondmengsel zwaarder wordt en de potten niet zo snel omvallen.<br>De verhouding porgrond en toeslagmiddelen is 60-40, maar die 40 heeft natuurlijk ook een verhouding: Perliet 20, Akadama 10, Lava 5 en diverse grind ook 5.</p>
</div></div>



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